Filter



Patented May 28, 193s PATENT OFFICE A .y ,l fsgciaims. (c1. 21o-fissi This invention relates-toniters for liquids bf' any characterand' has partic'ular reference to hollow-leaf filters', `wherein 'suitable substances are utilized to supplement the viltering action of the screen or cloth,"and the vprimary objectv of the" invention isto provide simple and durable iilter-l ing structure having means for properly4 positioning and maintaining a series of hollow filter leaves in properrelated positions; means for re-v movablyaflixing lterng *screens in place; andj the unique frame, froml which projects an outlet pipe with means thereon for removably engaging aheader.r l l Y j Another object of this invention'is to` provide a joint-between-outlet pipe and header that will permit replacing'of the hollow leaf of the filter without the necessityof manipulatingy clamps, bolts, screws or other members that are-likely to cause diniculty `vand `ther`eby yrequire a largej amount of time when replacementsof any iilter` leaf becomes necessary. I y Many minor structural details forming other objects of the invention-'will be 'made apparent during the course of thev following specification, referring to the accompanying drawing,wherein:

Figure 1 is a lvertical cross section through a filter made in accordance with this invention and having parts of the lhollow lter leaf broken away for clearness. i.

Fig. 2 is another vertical cross section through a. filter having a series of hollow lter leaves.

Fig. 3 is an enlargedcross section taken on line III- III of Fig. 1, and,`

Fig. 4 is an enlarged, fragmentary, detailed, rsectional view through the joint which establishes connection between the outlet pipe from thehollow lter leaf and the header of thelter.

Hollow filter leaves constructed as shown, require periodic cleaning, and it is with such leaves that the scraper and other structure shown in my copending application Serial Number 659,513, filed March 3, 1933, is used.

In the illustrated embodiment of the present invention is shown a retort 8, into which is introduced, under pressure, the liquid to be ltered and from `which header I0 extends to remove the` illtered liquid. A series of hollow leaf members is positioned within retort 8 and each is con nected to header I Il through the medium of a novel joint shown in Fig. 4 and hereinafter more` screen I6 is'first'applied to each side of frame I4, after which a screen I8 of appreciably finer mesh is applied and upon which collects such ltering powder or medium as `may be introduced into retort 8.

` AA channel-shaped binder20 may be used`to secure screens -I6 and I8 lin place upon frame I4. When such is used, screens I6 and I8 are engaged at their edges between frame I4 and the normally parallel,laterally extended walls of binder 28, and 10 because ofthe resilient propertyof this binder 2li', it-may be removed'and replaced a large numberv of times` as its effectiveness 'is retained. l y3 Such lter leaves as embody this `invention should have the sidefscreens I 6- and I8 thereof 15 disposed inplanesfsubstantially parallel to each other and there should be means whereby `collapsing' ory anyfinwardibulge is precluded. Accordingly, fal'plur'ality `oi'fribs 22 are employed,

i I4 to the opposite sideythereof andhas a number of perforations `24"formed`therethr'ough to permit fr'ee passage ofl thegflltered liquid. Ribs 22 are substantially thesaine width as frame I4 and each rib` 22 shouldfbe' formed of channel25 ironto present a'substantially flat surface, against which screens I6 and I8 will bear when liquid is being forced therethrough under high pressure.

An outlet pipe 26, having openings 28 formed therein extends from one side of frame I4 to and through the other side thereof to present a projected joint portion, formed as shown in Fig. 4. This projected portion of pipe 26 has an 'annular groove 30 formed therearound and an annular inclined shoulder 32, likewise formed 35 thereon at a circumferential line spaced inwardly from the projected end of pipe 26. Two or more slots 34 are formed in pipe 26 at the projected end and extend inwardly longitudinally from said end, as shown. Referring to Fig. 1, 40

vitfwill be observed that slots 34 are ared at theirouter portions to allow easy positioning over 'pins 40. Furthermore, pipe 26 is tapered at its outer end to facilitate its insertion in tube 36. Tube' 38, integral'with header I0, receives 45 the yprojected end of pipe 26 so that a telescoping relation between pipe 26 and tube 38 is established and the surfaces which contact should be ground to present a liquid-tight joint.

The end of outwardly extending tube 36 has 50 an inclined face 38 formed thereon, the angle of inclination thereof being the same as the angle of inclination `of shoulder 32. When pipe -26 and tube 36 are telescoped, these two inclined faces are in engagement and the action of graveach of which extends 4"from one side of frame,` 20

36. When shoulder 32 and face 38 are in en gagement, stop pins are held a short distance away from the bottom or end of slots 34 so that the entire weight Volf member I2 is utilized in forcing together faces "32 and 38.

Obviously, from the foregoing it will be seen that the entire hollow leaf filter` member I2 may be bodily lifted from its support without removal of any parts or loosening or other manipulation such as has heretofore been necessary. Y

The relation between openings 28 in? pipe 26, openings 2l in ribs 22, and the mesh of screens I6 and I8 is such as to permitfree passage of the liquid and in the event it is desired to place an auxiliary iilter bag over the entire hollow leaf member I2, such may be done by usingthe conventional type of bag and securing' it in place by drawing the mouth thereof into annular groove 30 which is formed for the purpose.

When such a filter'V construction is used with the clemiing devices shown in my aforementioned copending application, it will be found that the ease and speed of operation and the saving in operating cost will be a substantial amount, and. when such leaf structure, is used, the effective.

areak thereof is greatly diminished fora given amount of work where a pressure of atleast iive pounds is built up".

' Having thus described thefinvention, what is `claimed as new and ydesired to be secured by Letters Patent is:

1. In a filterof the character described having a retort for receiving the liquid to be ltered anda header to remove the flltered'liquid from 'the retort, al'plurality of hollow leaf filter memwith the said outlet pipe, and an inclined face formed on the end edge of said tube bearing against the inclined annular shoulder and means associated with said pipe and tube tlpermit rel Y ative longitudinal movement and to preclude relative rotation thereof.

2. In a iilter of the character describedghaving a retort for receiving theliquid to he filtered and a header to remove the filtered liquidfrom the retort, a plurality of hollow leaf iilteiA members removably mounted on the saidgheader, each havingl a cylindrical outlet pipe projecting from the leaf, an annular inclined shoulder formed around the projected portion ofgsaid outlet pipe at fa point spaced inwardly from the -end thereof, slots formed in the outlet pipe at the projected end thereof and extending longitudinally inwardly therealong toward said shoulder and terminating in spaced relation thereto, a cylindrical tube integral vwith the header in telescoping engagement withthe saidr projected end of the. outlet pipe, aninclined face formed on the end of said tube for engagement with the said inclined shoulder to support the said filter member, and pins carried by thetube for engagement with the said slots, saidpins precluding relative rotation of pipe and tube about their axes, said shoulder and inclined face being in engagement as the said pins are in the said slots between the ends of the latter. 1

3. In a filter of the character described, a hollow-leaf member comprising an open frame, a series of perforated ribs extending between opposite sides of said frame, said ribs being equal in width to said frame, a filter screen on each side of the frame, an outlet pipe, having openings formed therein, within said hollow leaf, and means for removably securing said filter screens in place comprising a channel member having the parallel Walls thereof in gripping engagement with the frame of said leaf, the saidiilter screen being between said frame and the said channel member.

MATTHEW F.MORAN. 

